Children plays on a seesaw installed between the steel fence that divides Mexico from the United States in Ciudad de Juarez, Mexico, Sunday. The seesaw was designed by Ronald Rael, a professor of architecture in California. (Photo: AP)

A migrant girl plays soccer near a Mexican immigration center where migrants set up camp in Matamoros, Mexico, 2019, on the border with the US. (Photo: AP)

Children migrants play cards at an encampment set up by migrants near a Mexican immigration office in Matamoros, Mexico, Wednesday, on the border with the US. (Photo: AP)

A migrant girl from Kenya, top, plays with bottle caps alongside other migrant children outside a Mexican immigration office in Matamoros, Mexico, Wednesday, on the border with the US. (Photo: AP)

A migrant father and daughter sit on the sidewalk after getting off a bus that brought them all the way from Nuevo Laredo to Monterrey, Mexico. The group was placed on the bus by Mexican migration authorities, arriving in this northern Mexican city late at night and left them to fend for themselves with no support on housing, work or schooling for children, who appear to make up about half the group. (Photo: AP)

Migrants sit in a bus that will take them and other migrants to Moneterrey, from an immigration center in Nuevo Laredo, Mexico. In Monterrey they found a city where shelters are already overflowing and it quickly became clear that it would be up to them to make do as best as they could. (Photo: AP)

A Honduran migrant man speaks on a cell phone, accompanied by his daughter, after they and three other members of their family were freed by police after being kidnapping days ago in Veracruz, Mexico, Tuesday, July 30, 2019. The Veracruz state prosecutor for crimes against migrants says the two adults and three children from the Vela Ruiz family are in good condition after being freed in the neighboring state of Chiapas. They had been reported kidnapped July 24. (Photo: AP)